COMMUNICATIONS. 361 



For machinery purposes, when mixed with stronger iron, it 

 gives solidity and smoothness, and improves the same, although 

 too weak to use alone for this purpose. 



A. J. Langworthy. 



OsHKOSfl, June 8, 1857. 

 This is to certify that, we have used the pig iron manufac- 

 tured by the N. W. Iron Co., for three years, and by mixing 

 1-3 H. R. iron, 1-3 Scotch and 1-8 Wisconsin, it makes an ex- 

 cellent machinery iron. But for building purposes, or for gas, 

 steam and water pipe, the Wisconsin iron manufactured by the 

 N. W. Iron Co., used without any admixture of other irons, 

 cannot be excelled by any iron that c imes to this market. 



Powers, Rogers & Co. 



Fond du Lac, June 8, 1857. 



To THE NORTHAVESTERN IrON Co., DodGE Co., WiS.: 



Gents : — We have been using your iron for four years, and 

 iind by mixing 1-3 Rossee, and 1-3 strong scrap iron, it makes 

 excellent machinery. No better mixture of iron can be procured 

 in this market. 



On account of its solidity and the smoothness of its surface, it 

 is the best quality we know of for building, castings, and es- 

 pecially for gas, water and steam pipe, requiring no admixture 

 with other irons for those last purposes. 



WiLBER, Peacock & Co. 



IRON ores of MARSTON, BLACK RIVER FALLS, ETC. 



A deposit of black hemetite occurs in the lower sandstone of 

 Wisconsin, (Potsdam sandstone,) at Marston, Sauk Co. 



A deposit of hemetite, which seems likely to prove of great 

 value, occurs also at Black River Falls, associated with horn- 

 blende and chloretic slates. It seems to be the western termi- 

 nus of the great iron range which extends across the northern 

 2r 



